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Clear last x entries of R console

4 messages · Duncan Murdoch, angliski_jigit, Greg Snow

Original
angliski_jigit
# 
Hi All,

I am trying to build in a progress-tracker into my loops that let me have a
sense of their progress. I'd like to be able to output to screen a series of
periods "...." etc. for each completion of the loop, but I <don't> want to
build a pyramid, e.g.
.
..
...
....
etc. So I need to be able to delete <the last line> of the console entry to
accomplish this. There are commands to erase the whole console, but that's
not what I want either; ideally, the command would allow me to erase the
last line or the last x lines.

Thanks
Angliski


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Duncan Murdoch
#
On 12-02-03 9:00 AM, angliski_jigit wrote:
Just don't write out a newline.  E.g.

for (i in 1:10) {
   cat(".")
   flush.console()
   Sys.sleep(1)
}

You can write out a CR using \r if you want to overwrite the previous 
line, e.g.

for (i in 10:0) {
   cat(i, " \r")
   flush.console()
   Sys.sleep(1)
}


Duncan Murdoch
angliski_jigit
# 
Thanks! I had a quick play with cat() in the command line (e.g. typing
cat(".")) and didn't seem to help because it just sent me to a new line; I
see now that when put into a script though cat() is all you need.
Thanks, AJ 

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Greg Snow
# 
You may want to look at functions like: txtProgressBar, winProgressBar
(windows onnly), or tkProgressBar (tcltk package), rather than
reinventing the wheel.

On Fri, Feb 3, 2012 at 7:00 AM, angliski_jigit
<angliski_jigit at hotmail.com> wrote: